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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b804eadab1bb12ca98f9b7208a83ae23e44589a3c665ed041fc94918c479ca' 
  AND token = 'bpaWtNSARmll5N9fDr9LvG9JLYc5cPf3Y5mxb7d4dvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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