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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be796bb20628f0ef25b545bbe7af72ee7ba0088e39e76f002a15853616d15be' 
  AND token = 'Ozyx/ZI81vsWECiw5CECH+x+ia6KybwEgrSSOfqcDF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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