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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf86efada2c9c4c144258dfa139dc62793f65620d198606691d6fddef2e4d9b7' 
  AND token = 'd+DQ/7/gIXkkT6/UCjC+P6f/iNodZXCw0DjAt7cKXMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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