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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5badb89132e75c36371a13226b0f545addf95f8d9fda2da15ac01507b85f72e9' 
  AND token = 'n/wBDr14CEzTgEWVe92rgMkjept8aq23p1kDepEj79A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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