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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45cd43da8d4c59f0ac6b40d6963c82324b8f3db129e6abf63ec9b51525f2813e' 
  AND token = 'CAhT+Ht2fdMNbDA9YW35VlWM8X9JYT2mbal3MCBQpCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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