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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f1ecbf2cf6610b1794c9e4b75f6e7f58f395bd599b58304de3455fdcbd7d68' 
  AND token = '79TbUsJNZebT0bB+3a/yXR9pUJOyhlqMaNZT2K0FpPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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