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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6eebc149287e667d894c2a8b9840f8a1f492db9fe4f95bc52c70aa4d7d8ceed' 
  AND token = 'ZZXF7OCexH8r2yhp5pkPfS303C5kp/Ub4ZTnwDVa5H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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