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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4fda4990da8f7c57113d0214038cfaead78a7b358b67f751bc1c0e0e0d86b6' 
  AND token = 'o7mZ3B86OVihkDgHDV68q9WF7wAqSEftDtsRiFeOyJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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