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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b114b914b0ff97e12ce7cba486b1d649419177c98a67648458ca2676e2281666' 
  AND token = 'zMLtmmW5V11BS1Vt8SW5SsMNRgUo26pfYkEEqMhHKO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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