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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf98e7975080e7ce36c2cb2076b13341b76ef4a2e220ae6eb213182ce9804ec' 
  AND token = '24f+ctf6Q30Uv59WGIV4OYCVKgTzcF5qq1UuIJo1+hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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