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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cca3a22dda3bb557b07a2835dcc6e14d0cdbd718e51d3ecb8f292c5c561d1be' 
  AND token = '6bumrWvZkIu86MoAvspZbS7bLJT1Het+SCbudg8QgWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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