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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e767cf6f7bc213ec140a4cee08478e9d7e781240bf2e50ec803ad7dda9481de' 
  AND token = 'EVVdPV9Ef6PVCG/DNLka4+Dj8jy0B1c8Mv/gzvRAdJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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