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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e767e24bda4c57b253337b9f087e044f56a863517d885382675d2712dbc085e0' 
  AND token = 'vaubMjDM5p97wCXBkh0FoqX0IxP0nLLBeZqF7j8ADfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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