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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d42b6cfb5e09b7e367a8d528eb7fcdc78db2b2ae23f9eef7023c403fe8d98f9' 
  AND token = 'Nl/57hTIexOzYpMw00rKiyV/cMjdAFckWW5aSDkG0RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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