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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000e9b3cb96dc5164371c2c9b5c8466df36d4d04cf05a4e32cbefac101766d61' 
  AND token = 'P3raf6R7joOmW+7rMgVZceMAWN2VGeiQ7J/cZ5vxgrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00166

JSON explain

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