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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdbe4c000f95f33f28ad163a9f82480762de9725d1391742ef08f30df6f552f' 
  AND token = 'gj0GqQsAfE1eoRbUIqqoJv57N6UT8j33n7ZaySgSl8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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