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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926a545e7c4e6988788cf9c7c3a68b09f18e91f260f2cb33dde8fcde9712854b' 
  AND token = 'Y5bXZt5jQue5T43Y07qZHSxE1GCyKD+oF3A7byKSQAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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