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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec7fefbf1d542cb8ac9aac47fbf908aaac54ed4da09d8a794f14138a13d64ee' 
  AND token = 'g06eYU8wXusn9HslG+4ELbQip0/VTKuWLnH1nBf4dvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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