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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef645790da15c6aaf06109a6ba77c0230d9d72197d00b60d32ae23f45d6924d' 
  AND token = 'yzptz/V12VBX8I1ar8W9OHrQPobBNf4J0wbF25TVvJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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