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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f99436e20148756f708432f417e5b28fdec2bdd30d2ef4292607da1ad2c0ca' 
  AND token = 'xU+EKGYXnmFVY/RK4Wd++dZUmA3wXKXsSdf+fpYv128=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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