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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6050b504873f40d2f4acc6e78c53ae6923618d95ea572e5fa1179bfffebe59ce' 
  AND token = 'GH3yJ1bdmJQDhXcU7jb3pF76DWHQ/tYtQUkUuBkpV5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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