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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ba479d05c5278769b77d640ef7069b3a5022c45bba80536ab7e90ed7c409dd' 
  AND token = 'VROnu5ymlxd3HDe+5QQVbMP9XB0eU0emfGCJ64Snf5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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