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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e533bd266a089274b67133c9dda65bcb35ef85feada024c47f83dbc68ca9a4d3' 
  AND token = 'ZNqZ1yFwEDQ/8LYZhu4Tgz8nDI3YAiIAYcuXkAdQHwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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