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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0405bf791d6910b320167260e3070aa7d41d15f03cf061df3fb664a20bce59a' 
  AND token = 'vRPoZCRbtWdHrGo1O2AXHL4oe0PLNCujLDmtRASnigw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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