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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe4b905e2312b91ad9884715dcc520ccf12a4b70625b13c470732b6d105c3b2' 
  AND token = 'ckGLroEeXASPZp3TcA/25HuwwKqO6Tv4tgITGelTLp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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