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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d7304194701ebf5596812924826dc6906b71ef9409d2409377fc3b2ab481b3' 
  AND token = 'rHo2NEY4Ld2cYOkk1E5x2ZfbuJbKYny16PSKqqZEwKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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