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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c636f2fb2aea43782ff22c831facf757f5529b19434b2568f17ffcea0e5f721' 
  AND token = 'ESGhKD+WpX2+DqIk+JJ8Qyd3zaOOcEPzwV5NRCYX1Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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