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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d491267f93de5e0b5fcac7d76d89d48c62bc69dba0adcfb6409fef38b4fb1b' 
  AND token = 'ctewI9l/7ax1qN8v01E3RwgbF3flmBcFdHVav0Ww4ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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