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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c316eaf35514436dd3b17cd772c72280ff41b16cb6265323867a1fdc52fb44' 
  AND token = 'Is8GXOixoz7ma0dHZzcoOjv9JxLHJy2ABWOxQyYq0TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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