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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911d9891d956ea9c220e01518f0ee5edbc9edb813b0f44925811f9d081091524' 
  AND token = 'QIyDfYKPn1Sksanl9cANEKhTLPxdYu/f2ry+EQ2UL+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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