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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1298c503054b5a059747a87cc26bd3041bc5afc6d8f3cb15a4197d6394c7f0' 
  AND token = 'AS3plE7R6ufVlHcc3u/qEGg8cvbrmP6ZImVH+YVCmfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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