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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d78625eb69fc1b7c99dc87aedeb5e010f26e32e26e05b8163312feb2cbd2839' 
  AND token = 'g/1PBnlKCk4Fe0WlPlqmzOo7mevZDdNCqV8U6P0jwMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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