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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17c5946d1d09a689470a814f9b87b81288576384d0524e74cbd462bc3fb0c99' 
  AND token = '5kxBX/CghmJEE+ugQ7ryogeEP5fR6t1XCsi964tez3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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