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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb8a9197360b8abac1c028947e6055a6ecb56fe4d4b58618489332441da11e8' 
  AND token = 'AQJTYjieNV0RzUOiNS/l6KoXmgt1Bf6iWjXzXb3R4OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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