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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce7d1a905cb3beab6604efc69c3d6f965daf450b915f76c63583aa3dbe52ab5' 
  AND token = 'qhqLGsu6UI8fBOn7HbtAcLt1cj6NPBcI1Dm5N+cDes4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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