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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3b668e917a830312aaec7bd24b35ece1452e49d8f6800e87ecc7daf229add8' 
  AND token = '8a+JKabeGjMzT1uBYmTl7I07Gg0EiHQsUciSyfyI6h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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