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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b8880e3ccd4e27e45bcbd18cb1ee0dd700178e8b87302c16b99b8f8b8d8f7a' 
  AND token = 'C3X9qe5zYfChA3t9rA49L/ibRdckuC8FWCDBbNKV0Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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