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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994c7e0dd23fcb159a0cc1bc4025cced008a2b392fc9366c0b833e6a239401b1' 
  AND token = 'BtDz2LlXpcoV/l0kfSb5G3h+uFsgYtdlhfTbvFq+eKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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