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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce384d5b13dcb05c1f203c506b2298c15ef4c4af1d91fe8b1213cb307cbf1ff6' 
  AND token = 'xyr/hJua4XiHNIooA9cmx4BZAPogAmhd51CeSAvPoC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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