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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f3120d16bcd5010ae1e4516d1c9b945635ef5c5a0895f809eddd5ae06c032b' 
  AND token = 'OH3P15v8iFb4ryEIXZL8BFAajBYSO2w72l3GsKk7MW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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