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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553fd9b63d7725c789e4124efa414ed819525c791fa4da5c3c24ad7705bdf4ee' 
  AND token = 'VsiYCPK/HigMIFfyiE9N/pwNQk2Ek6GuxWsn1Thz+HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00142

JSON explain

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