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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8adbccc371ec057b2da089f53406b6b616c09ca4d998bdc86f21935dd941fcd0' 
  AND token = '7S3D75Q+T1SRXl9zNh8OVSFYD0HRWE8xuniS81OksYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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