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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c74da796e89d598c01a33cefaa612a584f7aba3811ecc509095e5c5cb64c52' 
  AND token = 'rwUICDkR0wxO6PCOEbfWUDMYS+Enlr9fyFBqy6tKO8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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