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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08693257b75248870268c899fcac467eb91d6a14963d4c33b244901fd2447f9' 
  AND token = 'lpfA2qOAq+S/jCZfFfmEEdZ8Tuyzqjacji8mSThr3yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}