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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6691026b437ecdd841b0b7d279096c183fb1b542d7655770a1d69756ccd478' 
  AND token = '7e5cYpbdUlLQE3mxRjSLSx/spduw+UWnQ5TFFMiRpYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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