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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8544ef78f086f25382acaa13d9d7ffa3d2a869ee8acd0f9926c9960ab8800188' 
  AND token = '7Z/nWyYICznKMksB6CmJ9/E7iGI0yAW0ZpFtDzhOB2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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