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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4dda836ef3ac4ec9d7fd3eb9717a14e55adafd4edadc8c67a6b3f320cbb2133' 
  AND token = '62fkMd4vPsE+pubgBcbgwRp2bF9+wG61w9HTvUoEfgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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