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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce99a69d526ee9b60e7c80a3cf646c97e739a6418eaf7d0cab8b82101a83ac0' 
  AND token = 'GF4s/9xPICMPUPz9KOdjnDfooKkF7/O4eeOPP22LWU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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