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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639dad58d9c04fd8888cc03ca2ece2f9dfc9047d547708dec5d1b658cea4a2c5' 
  AND token = '4NJUJoWlaIg24a2v6xPEMr/pLkWlX4iQmE4XycFGNTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00245

JSON explain

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