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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a412309b99d3f5c655cf343bfb29e62c439ca5dc2db74dbb57771c7dca21845c' 
  AND token = 'cNO/vGOOciRtQEJyAb0ljuK6BukDkYE0iLNJRhldJlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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