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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3e7f8d0d930c4ec78009d9aaffa982d975c1b486e6d955ea635a223c536def' 
  AND token = 'ILAHxkGMp/qhKDS+2wyaeMUx0SPqfijUPiBE9F1Tkfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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