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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf6ca7ab1a7a2479ab5ee464aedddc1ad5f5bccfcf8f60270c3e86eadc8072c' 
  AND token = '8AV/bVndFtIjRkVKStscK0iGv9yR3K5l9j0PzXFTshM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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